I relate it to a driving experience. One in which I drive to a certain destination often enough, that I become more and more familiar with the route that takes me there. I learn the best streets getting to and off the freeway system, every exit along the way. I know the interesting segments, the boring stretches. Most importantly, I start to recognize traffic patterns, and can predict the areas of congestion that will slow me down. No matter which route I take, there’s usually one portion of the trip where I know I’ll slow to a crawling pace. Some routes can’t be avoided, and the delays they bring must be factored into the total time I think the trip will take. continued